20920909080 has 32 divisors (see below), whose sum is σ = 62762727600. Its totient is φ = 5578909056.

The previous prime is 20920909057. The next prime is 20920909091. The reversal of 20920909080 is 8090902902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87170335 + ... + 87170574.

Almost surely, 2^20920909080 is an apocalyptic number.

20920909080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20920909080 is an abundant number, since it is smaller than the sum of its proper divisors (41841818520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20920909080 is a wasteful number, since it uses less digits than its factorization.

20920909080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174340923 (or 174340919 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The spelling of 20920909080 in words is "twenty billion, nine hundred twenty million, nine hundred nine thousand, eighty".